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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567b6e86579e6fe67080afa5e0643170a862510de471839addb39291b18afd6d' 
  AND token = 'gRQa/BkRromLPTSLKcwvXxseGHtPI0yWWg9HPwAmKeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}